Create or edit your configuration.xml file to specify the 64-bit edition and your organization's volume licensing key (KMS or MAK):

Older, proprietary COM add-ins or VBA macros created strictly for 32-bit architectures will not run on 64-bit Office. They must be updated or recompiled.

Excel users working with spreadsheets over 2GB need 64-bit architecture to access more system memory.

According to security reports from 2020–2025, over found on open indexes contain hidden malware. Common payloads include: